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Old 09-30-2014, 12:12 PM   #2
blw2
Senior Member
 
Brand: Thor Motor Coach
Model: 2013 31L
State: Florida
Posts: 2,181
THOR #908
Modern converters are multiple stage chargers
they charge at different rate depending on the state of charge
faster at first slowing to a trickle for maintaining charge

Look in your converter's manual (should be available online). it will explain the charging functions.....

One things almost certain, if your batteries are seriously low, you need to run the charger for a long period of time for a full charge..... like many hours to a day.....

Oh, and be careful to not discharge your batteries too low. Most folks say don't depelte them lower than the 50% mark, but this depends a bit on the type of battery. 50% is a good rule of thumb.
here's a good read
The 12volt Side of Life (Part 1)

I'm no electrical expert, but I don't think it will be helpful to connect a second charger at the same time. Some higher end chargers would likely charge faster than your converter, but since the chargers work off of their sensed voltage I'm thinking it won't work.
What I mean by that is
your converter will be trying to charge your battery so the voltage applied to the battery will be high.
the external charger will sense that the voltage is high and will not charge, or will step down to a trickle mode.
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